#include "mdadm.h"
#include "md_p.h"
#include <sys/utsname.h>
+#include <ctype.h>
/*
* Parse a 128 bit uuid in 4 integers
if (ioctl(fd, RAID_VERSION, &vers) == 0)
return (vers.major*10000) + (vers.minor*100) + vers.patchlevel;
-
- if (MAJOR(stb.st_rdev) == MD_MAJOR)
+ if (errno == EACCES)
+ return -1;
+ if (major(stb.st_rdev) == MD_MAJOR)
return (3600);
return -1;
}
int get_linux_version()
{
struct utsname name;
+ char *cp;
int a,b,c;
if (uname(&name) <0)
return -1;
- if (sscanf(name.release, "%d.%d.%d", &a,&b,&c)!= 3)
- return -1;
+ cp = name.release;
+ a = strtoul(cp, &cp, 10);
+ if (*cp != '.') return -1;
+ b = strtoul(cp+1, &cp, 10);
+ if (*cp != '.') return -1;
+ c = strtoul(cp+1, NULL, 10);
+
return (a*1000000)+(b*1000)+c;
}
int enough(int level, int raid_disks, int avail_disks)
{
switch (level) {
+ case 10: return 1; /* a lie, but it is hard to tell */
+
case -4:
return avail_disks>= 1;
case -1:
case 4:
case 5:
return avail_disks >= raid_disks-1;
+ case 6:
+ return avail_disks >= raid_disks-2;
default:
return 0;
}
return 0;
}
-void uuid_from_super(int uuid[4], mdp_super_t *super)
-{
- uuid[0] = super->set_uuid0;
- if (super->minor_version >= 90) {
- uuid[1] = super->set_uuid1;
- uuid[2] = super->set_uuid2;
- uuid[3] = super->set_uuid3;
- } else {
- uuid[1] = 0;
- uuid[2] = 0;
- uuid[3] = 0;
- }
-}
-
-int compare_super(mdp_super_t *first, mdp_super_t *second)
-{
- /*
- * return:
- * 0 same, or first was empty, and second was copied
- * 1 second had wrong number
- * 2 wrong uuid
- * 3 wrong other info
- */
- int uuid1[4], uuid2[4];
- if (second->md_magic != MD_SB_MAGIC)
- return 1;
- if (first-> md_magic != MD_SB_MAGIC) {
- memcpy(first, second, sizeof(*first));
- return 0;
- }
-
- uuid_from_super(uuid1, first);
- uuid_from_super(uuid2, second);
- if (!same_uuid(uuid1, uuid2))
- return 2;
- if (first->major_version != second->major_version ||
- first->minor_version != second->minor_version ||
- first->patch_version != second->patch_version ||
- first->gvalid_words != second->gvalid_words ||
- first->ctime != second->ctime ||
- first->level != second->level ||
- first->size != second->size ||
- first->raid_disks != second->raid_disks )
- return 3;
-
- return 0;
-}
-
-int load_super(int fd, mdp_super_t *super)
-{
- /* try to read in the superblock
- *
- * return
- * 0 - success
- * 1 - no block size
- * 2 - too small
- * 3 - no seek
- * 4 - no read
- * 5 - no magic
- * 6 - wrong major version
- */
- unsigned long size;
- unsigned long long offset;
-
- if (ioctl(fd, BLKGETSIZE, &size))
- return 1;
-
- if (size < MD_RESERVED_SECTORS*2)
- return 2;
-
- offset = MD_NEW_SIZE_SECTORS(size);
-
- offset *= 512;
-
- if (lseek64(fd, offset, 0)< 0LL)
- return 3;
-
- if (read(fd, super, sizeof(*super)) != sizeof(*super))
- return 4;
-
- if (super->md_magic != MD_SB_MAGIC)
- return 5;
-
- if (super->major_version != 0)
- return 6;
- return 0;
-}
-
-int store_super(int fd, mdp_super_t *super)
-{
- long size;
- long long offset;
-
- if (ioctl(fd, BLKGETSIZE, &size))
- return 1;
-
- if (size < MD_RESERVED_SECTORS*2)
- return 2;
-
- offset = MD_NEW_SIZE_SECTORS(size);
-
- offset *= 512;
-
- if (lseek64(fd, offset, 0)< 0LL)
- return 3;
-
- if (write(fd, super, sizeof(*super)) != sizeof(*super))
- return 4;
-
- return 0;
-}
-
-
-
int check_ext2(int fd, char *name)
{
/*
return 0;
if (read(fd, sb, 1024) != 1024)
return 0;
- if (strncmp(sb+52, "ReIsErFs",8)!=0 &&
- strncmp(sb+52, "ReIsEr2Fs",9)!=0)
+ if (strncmp((char*)sb+52, "ReIsErFs",8)!=0 &&
+ strncmp((char*)sb+52, "ReIsEr2Fs",9)!=0)
return 0;
fprintf(stderr, Name ": %s appears to contain a reiserfs file system\n",name);
size = sb[0]|(sb[1]|(sb[2]|sb[3]<<8)<<8)<<8;
int check_raid(int fd, char *name)
{
- mdp_super_t super;
+ void *super;
+ struct mdinfo info;
time_t crtime;
- if (load_super(fd, &super))
- return 0;
+ struct supertype *st = guess_super(fd);
+
+ if (!st) return 0;
+ st->ss->load_super(st, fd, &super, name);
/* Looks like a raid array .. */
- fprintf(stderr, Name ": %s appear to be part of a raid array:\n",
+ fprintf(stderr, Name ": %s appears to be part of a raid array:\n",
name);
- crtime = super.ctime;
+ st->ss->getinfo_super(&info, super);
+ free(super);
+ crtime = info.array.ctime;
fprintf(stderr, " level=%d devices=%d ctime=%s",
- super.level, super.raid_disks, ctime(&crtime));
+ info.array.level, info.array.raid_disks, ctime(&crtime));
return 1;
}
-
int ask(char *mesg)
{
char *add = "";
return map->num;
map++;
}
- return -10;
+ return UnSet;
+}
+
+
+int is_standard(char *dev, int *nump)
+{
+ /* tests if dev is a "standard" md dev name.
+ * i.e if the last component is "/dNN" or "/mdNN",
+ * where NN is a string of digits
+ */
+ char *d = strrchr(dev, '/');
+ int type=0;
+ int num;
+ if (!d)
+ return 0;
+ if (strncmp(d, "/d",2)==0)
+ d += 2, type=1; /* /dev/md/dN{pM} */
+ else if (strncmp(d, "/md_d", 5)==0)
+ d += 5, type=1; /* /dev/md_dNpM */
+ else if (strncmp(d, "/md", 3)==0)
+ d += 3, type=-1; /* /dev/mdN */
+ else if (d-dev > 3 && strncmp(d-2, "md/", 3)==0)
+ d += 1, type=-1; /* /dev/md/N */
+ else
+ return 0;
+ if (!*d)
+ return 0;
+ num = atoi(d);
+ while (isdigit(*d))
+ d++;
+ if (*d)
+ return 0;
+ if (nump) *nump = num;
+
+ return type;
}
+
/*
* convert a major/minor pair for a block device into a name in /dev, if possible.
* On the first call, walk /dev collecting name.
} *devlist = NULL;
int devlist_ready = 0;
+#ifdef UCLIBC
+char *map_dev(int major, int minor)
+{
+#if 0
+ fprintf(stderr, "Warning - fail to map %d,%d to a device name\n",
+ major, minor);
+#endif
+ return NULL;
+}
+#else
#define __USE_XOPEN_EXTENDED
#include <ftw.h>
+#ifndef __dietlibc__
int add_dev(const char *name, const struct stat *stb, int flag, struct FTW *s)
+#else
+int add_dev(const char *name, const struct stat *stb, int flag)
+#endif
{
if ((stb->st_mode&S_IFMT)== S_IFBLK) {
char *n = strdup(name);
struct devmap *dm = malloc(sizeof(*dm));
if (dm) {
- dm->major = MAJOR(stb->st_rdev);
- dm->minor = MINOR(stb->st_rdev);
+ dm->major = major(stb->st_rdev);
+ dm->minor = minor(stb->st_rdev);
dm->name = n;
dm->next = devlist;
devlist = dm;
return 0;
}
+/*
+ * Find a block device with the right major/minor number.
+ * Avoid /dev/mdNN and /dev/md/dNN if possible
+ */
char *map_dev(int major, int minor)
{
- struct devmap *p;
- if (!devlist_ready) {
- nftw("/dev", add_dev, 10, FTW_PHYS);
- devlist_ready=1;
- }
+ struct devmap *p;
+ char *std = NULL;
+ if (!devlist_ready) {
+#ifndef __dietlibc__
+ nftw("/dev", add_dev, 10, FTW_PHYS);
+#else
+ ftw("/dev", add_dev, 10);
+#endif
+ devlist_ready=1;
+ }
- for (p=devlist; p; p=p->next)
- if (p->major == major &&
- p->minor == minor)
- return p->name;
- return NULL;
+ for (p=devlist; p; p=p->next)
+ if (p->major == major &&
+ p->minor == minor) {
+ if (is_standard(p->name, NULL))
+ std = p->name;
+ else
+ return p->name;
+ }
+ return std;
}
+#endif
-int calc_sb_csum(mdp_super_t *super)
+unsigned long calc_csum(void *super, int bytes)
{
- unsigned int oldcsum = super->sb_csum;
unsigned long long newcsum = 0;
- unsigned long csum;
int i;
- unsigned int *superc = (int*) super;
- super->sb_csum = 0;
+ unsigned int csum;
+ unsigned int *superc = (unsigned int*) super;
- for(i=0; i<MD_SB_BYTES/4; i++)
+ for(i=0; i<bytes/4; i++)
newcsum+= superc[i];
csum = (newcsum& 0xffffffff) + (newcsum>>32);
- super->sb_csum = oldcsum;
+#ifdef __alpha__
+/* The in-kernel checksum calculation is always 16bit on
+ * the alpha, though it is 32 bit on i386...
+ * I wonder what it is elsewhere... (it uses and API in
+ * a way that it shouldn't).
+ */
+ csum = (csum & 0xffff) + (csum >> 16);
+ csum = (csum & 0xffff) + (csum >> 16);
+#endif
return csum;
}
(long)(bytes>>30),
(long)(((bytes>>10)&0xfffff)+0x100000/200)/(0x100000/100),
(long)(bytes/1000LL/1000LL/1000LL),
- (long)((((bytes/1000)%1000000)+50000)/10000)
+ (long)((((bytes/1000)%1000000)+5000)/10000)
);
return buf;
}
return buf;
}
+int get_mdp_major(void)
+{
+static int mdp_major = -1;
+ FILE *fl;
+ char *w;
+ int have_block = 0;
+ int have_devices = 0;
+ int last_num = -1;
+
+ if (mdp_major != -1)
+ return mdp_major;
+ fl = fopen("/proc/devices", "r");
+ if (!fl)
+ return -1;
+ while ((w = conf_word(fl, 1))) {
+ if (have_block && strcmp(w, "devices:")==0)
+ have_devices = 1;
+ have_block = (strcmp(w, "Block")==0);
+ if (isdigit(w[0]))
+ last_num = atoi(w);
+ if (have_devices && strcmp(w, "mdp")==0)
+ mdp_major = last_num;
+ free(w);
+ }
+ fclose(fl);
+ return mdp_major;
+}
+
+
-#define MD_MAJOR 9
char *get_md_name(int dev)
{
/* find /dev/md%d or /dev/md/%d or make a device /dev/.tmp.md%d */
+ /* if dev < 0, want /dev/md/d%d or find mdp in /proc/devices ... */
static char devname[50];
struct stat stb;
- dev_t rdev = MKDEV(MD_MAJOR, dev);
-
- sprintf(devname, "/dev/md%d", dev);
- if (stat(devname, &stb) == 0
- && (S_IFMT&stb.st_mode) == S_IFBLK
- && (stb.st_rdev == rdev))
- return devname;
-
- sprintf(devname, "/dev/md/%d", dev);
- if (stat(devname, &stb) == 0
- && (S_IFMT&stb.st_mode) == S_IFBLK
- && (stb.st_rdev == rdev))
- return devname;
-
+ dev_t rdev;
+ char *dn;
+
+ if (dev < 0) {
+ int mdp = get_mdp_major();
+ if (mdp < 0) return NULL;
+ rdev = makedev(mdp, (-1-dev)<<6);
+ sprintf(devname, "/dev/md/d%d", -1-dev);
+ if (stat(devname, &stb) == 0
+ && (S_IFMT&stb.st_mode) == S_IFBLK
+ && (stb.st_rdev == rdev))
+ return devname;
+ } else {
+ rdev = makedev(MD_MAJOR, dev);
+ sprintf(devname, "/dev/md%d", dev);
+ if (stat(devname, &stb) == 0
+ && (S_IFMT&stb.st_mode) == S_IFBLK
+ && (stb.st_rdev == rdev))
+ return devname;
+
+ sprintf(devname, "/dev/md/%d", dev);
+ if (stat(devname, &stb) == 0
+ && (S_IFMT&stb.st_mode) == S_IFBLK
+ && (stb.st_rdev == rdev))
+ return devname;
+ }
+ dn = map_dev(major(rdev), minor(rdev));
+ if (dn)
+ return dn;
sprintf(devname, "/dev/.tmp.md%d", dev);
if (mknod(devname, S_IFBLK | 0600, rdev) == -1)
- return NULL;
+ if (errno != EEXIST)
+ return NULL;
if (stat(devname, &stb) == 0
&& (S_IFMT&stb.st_mode) == S_IFBLK
if (strncmp(name, "/dev/.tmp.md", 12)==0)
unlink(name);
}
+
+
+
+
+struct superswitch *superlist[] = { &super0, &super1, NULL };
+
+struct supertype *super_by_version(int vers, int minor)
+{
+ struct supertype *st = malloc(sizeof(*st));
+ if (!st) return st;
+ if (vers == 0) {
+ st->ss = &super0;
+ st->max_devs = MD_SB_DISKS;
+ }
+
+ if (vers == 1) {
+ st->ss = &super1;
+ st->max_devs = 384;
+ }
+ st->minor_version = minor;
+ return st;
+}
+
+struct supertype *guess_super(int fd)
+{
+ /* try each load_super to find the best match,
+ * and return the best superswitch
+ */
+ struct superswitch *ss;
+ struct supertype *st;
+ unsigned long besttime = 0;
+ int bestsuper = -1;
+
+ void *sbp = NULL;
+ int i;
+
+ st = malloc(sizeof(*st));
+ memset(st, 0, sizeof(*st));
+ for (i=0 ; superlist[i]; i++) {
+ int rv;
+ ss = superlist[i];
+ rv = ss->load_super(st, fd, &sbp, NULL);
+ if (rv == 0) {
+ struct mdinfo info;
+ ss->getinfo_super(&info, sbp);
+ if (bestsuper == -1 ||
+ besttime < info.array.ctime) {
+ bestsuper = i;
+ besttime = info.array.ctime;
+ }
+ st->ss = NULL;
+ free(sbp);
+ }
+ }
+ if (bestsuper != -1) {
+ int rv;
+ rv = superlist[bestsuper]->load_super(st, fd, &sbp, NULL);
+ if (rv == 0) {
+ free(sbp);
+ return st;
+ }
+ }
+ free(st);
+ return NULL;
+}
projects / thirdparty / mdadm.git / blobdiff